When re-building the VT's libutil Libtool detects the system's libutil as
dependency and tries to find a corresponding Libtool library (*.la). And here
is the problem: Libtool finds ompi/contrib/vt/vt/util/libutil.la which is still
present from the previous build and has nothing to do with the system's
libutil. Afterwards, Libtool fails on extracting the archive
ompi/contrib/vt/vt/util/.libs/libutil.a which isn't present for any reason.

There are different ways to fix the problem:

1. Apply the attached patch on ltmain.sh.

This patch excludes the target library name from searching *.la libraries.

2. Rename the VT's libutil

This would prevents name conflicts with dependency libraries.

3. Clear list of dependency libraries when building VT's libutil.

This could be done by adding LIBS= to the Makefile.am in
ompi/contrib/vt/vt/util/. The VT's libutil has no dependencies to other
libraries except libc.